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Water continuing to run after controller off

I have a 13 year old Toro sprinkler system in Mn. I am the second owner of the home.

There are 8 zones. 6 are pop-up rotator heads and 2 are drip irrigation.

I replaced the Toro controller with a Rachio controller.

All zones are working. While mowing the lawn on Monday, I found a spot in my lawn in which the grass was floating.
This is just downhill from where my drip irrigation line terminates.

The Rachio hadn't watered for a week due to rain and climate changes (it said the lawn hadn't dried out).

I checked my water meter and water was running. I made sure the Rachio was off and then turned off the water shutoff for the irrigation and the water meter stopped spinning.

I read online that a valve is probably stuck. The super weird thing is that there is only 1 small round irrigation box buried in the yard (that I know about). I popped off the cover and there is a bunch of wiring and appears to only be 1 valve.

How can an 8 zone irrigation system only have 1 valve? I've searched the rest of the yard and cannot find any other buried irrigation boxes.

On Wednesday night, I turned the shutoff back on and ran all 8 zones. The zones all ran fine and seemed to shut off fine. I don't hear any water running from the drip zone just uphill from the floating grass. (I can hear it when it's running). With all the zones off, I checked the water meter and it continues to spin.

I pulled the shutoff for the irrigation system and the meter stops running.